Bicycle rear wheel propelled by trailer mounted power supply and drive train

ABSTRACT

A bicycle may tow a trailer for the purposes of carrying a heavy or large object across great distances. A motor may be mounted to the trailer which drives a rear wheel of the bicycle. To this end, a transmission is added to the rear hub of the bicycle which is mechanically coupled to the output shaft of the motor. When the trailer is detached or not used in conjunction with the bicycle, the rider does not have to carry the weight of the motor. Also, this setup provides a stable configuration since the bicycle is pulling the trailer.

CROSS-REFERENCE TO RELATED APPLICATIONS

Not Applicable

STATEMENT RE: FEDERALLY SPONSORED RESEARCH/DEVELOPMENT

Not Applicable

BACKGROUND

The present invention relates to a motorized bicycle with a trailer.

Bicycles are utilized for various purposes. One purpose is to transportobjects from point A to point B. To this end, bicyclists may place theobject in a backpack or other hands-free bag/pouch that attaches to thebicycle to transport the object from point A to point B. The bicyclistmay not use his/her hands since the rider uses his/her hands to hold thehandlebars and stabilize the bicycle.

When the object is too heavy or too large for a backpack or otherbicycle mounted pouch, a trailer may be attached to the bicycle. Thetrailer may be towed behind the bicycle and allows the bicyclist totransport heavy and large objects that otherwise would not betransportable by bicycle.

When the weight of the object is too heavy, transportation of the objectfrom point A to point B becomes more difficult especially as the terrainbecomes steep or the distances become large. In this circumstance,motorized bicycles have been utilized to assist the bicyclist inpowering the bicycle and trailer. Unfortunately, the addition of a motorcreates other problems such as additional weight on the bicycle when thetrailer is not in use or jack knifing when the motor is mounted to thetrailer to drive the wheels of the trailer.

Accordingly, there is a need in the art for an improved system.

BRIEF SUMMARY

The trailer and bicycle discussed herein address the needs discussedabove, discussed below and those that are known in the art.

The bicycle may be retrofitted with a transmission or may be designedwith the transmission. The transmission is added to the rear wheel ofthe bicycle. The transmission when receiving power transmits such powerto the rear wheel of the bicycle to propel the bicycle forward. Thetrailer may be removably attachable to the bicycle, and moreparticularly, to the transmission which may be retrofitted to thebicycle. The trailer may have a motor mounted thereon. The motor througha mechanical coupling provides power to the transmission. This set up isbeneficial in that the weight of the motor is carried by the trailer sothat the rider does not need to carry the weight of the motor when thetrailer is detached from the bicycle. Moreover, the motor provides powerto the rear wheel of the bicycle instead of the wheels of the traileritself. This mitigates any unstable situation such as jack knifing.Additionally, the motor and other components mounted to the trailermaintain a low center of gravity so that attaching the trailer withmotor to the bicycle does not cause instability of the trailer.

More particularly, a human powered vehicle is disclosed. The vehicle maycomprise a rear wheel having a hub; a trailer removably attachable tothe hub of the rear wheel; and a motor attached to the trailer andmechanically coupled to the hub of the rear wheel so that the motor candrive the hub and rear wheel of the bicycle.

The wheels of the trailer may be free spinning. In other words, themotor does not drive the wheels of the trailer. The trailer may have twowheels.

The vehicle may further comprise a first bevel gear fixedly attached tothe hub; a second bevel gear engaged to the first bevel gear andoperative to transmit power to the hub through the first bevel gear; anda drive axle attached to an output shaft of the motor. The first andsecond bevel gears may be seated within a housing.

A switch mounted to a forward portion of the vehicle such as thehandlebar to control the motor of the trailer. The switch and the motormay be in wireless communication.

A plurality of drive axles may be attached to the motor and the hub fortransferring power from the motor to the rear wheel of the vehicle. Thedrive axles may be connected to each other with knuckle joints. A sleevemay be fixedly attached to the trailer with at least one of the driveaxles rotationally embedded within the sleeve. The sleeve may be curvedto allow the vehicle to make a left or right turn.

An axle of the wheels of the trailer may be at about the same level asthe hub of the rear wheel of the vehicle.

It is contemplated that the vehicle may be a bicycle.

Additionally, a trailer for a human powered vehicle is disclosed. Thetrailer may comprise a storage area; a free wheeled suspension systemfor rolling the storage area; and a motor attached to the storage areaand mechanically coupleable to a rear wheel of the vehicle to rotate therear wheel of the vehicle.

The free wheeled suspension system may have two wheels.

A plurality of drive axles may be coupled to the motor and coupleable tothe rear wheel of the vehicle wherein the plurality of drive axlestransfers the power of the motor to the rear wheel of the vehicle.

The trailer may further comprise a battery for powering the motor; aswitch mountable to a handlebar of the vehicle; and a controlleroperative to regulate an amount of power provided by the battery to themotor; wherein the switch is in communication with the controller toincrease or decrease the amount of power the battery supplies to themotor to increase or decrease a speed of the vehicle when the trailer isin use.

It is contemplated that the trailer may be used in conjunction with abicycle.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features and advantages of the various embodimentsdisclosed herein will be better understood with respect to the followingdescription and drawings, in which like numbers refer to like partsthroughout, and in which:

FIG. 1 is a side view of a bicycle with a removably attachable trailerwherein a motor is mounted to the trailer that powers a rear wheel ofthe bicycle;

FIG. 2 is a top perspective view of a hitch arm of the trailer shown inFIG. 1;

FIG. 3 is a bottom perspective view of the trailer shown in FIG. 1;

FIG. 4 is an exploded perspective view of a transmission thatinterconnects the trailer and the bicycle shown in FIG. 1;

FIG. 5 is a cross sectional view of the transmission and a hub shown inFIG. 2;

FIG. 6 is a bottom perspective view of a single wheel trailer mounted tothe rear axle at a rear portion of the bicycle; and

FIG. 7 is an exploded perspective view of a transmission for poweringthe rear wheel of the bicycle by way of the motor mounted to the trailershown in FIG. 6.

DETAILED DESCRIPTION

Referring now to the drawings, a bicycle 10 with a trailer 12 attachedto the rear portion 58 of the bicycle 10 is shown. The trailer 12 mayhave a motor 14 mechanically coupled to the rear hub 16 of the rearwheel 18 of the bicycle 10. The motor 14 drives the rear hub 16 and therear wheel 18 of the bicycle 10 to propel the rider, bicycle 10 andtrailer 12 in the forward direction. The trailer 12 carries the motor14. Beneficially, the trailer 12 can be conveniently removed or attachedto the bicycle 10 so that the bicyclist does not need to carry theweight of the motor 14 when the trailer is not in use. Moreparticularly, when the trailer 12 is attached to the bicycle 10, thetrailer 12 carries the weight of the motor 14 and assists the bicyclistin propelling the bicycle 10 and the trailer 12 forward by powering therear wheel 18 of the bicycle. When the trailer 12 is not in use (i.e.,detached from the bicycle 10), the motor 14 does not add additionalweight to the bicycle 10 because the motor 14 is mounted to the trailer12 and not the bicycle. Another benefit of mounting the motor to thetrailer instead of the bicycle is that the rider/bicycle's center ofgravity remains the same. Additionally, the motor 14 may be mountedunder a loading platform 36 of the trailer 12. In this manner, thetrailer 12 has a low center of gravity and is more stable.

Referring now to FIG. 1, the trailer 12 may be pulled behind the bicycle10 which provides for a stable configuration. The trailer 12 may beattached to the bicycle 10 at the rear portion 58 of the bicycle 10. Theloading platform 36 of the trailer 12 may be used to mount the motor 14,battery 40 and controller 42. Preferably, the motor 14, battery 40 andcontroller 42 are disposed generally at the height of the bottom bracketshell 60 of the bicycle 10. The reason is to maintain a low center ofgravity of the trailer 12 so that the trailer 12 does not tip over whentraversing over uneven terrain.

Referring now to FIG. 2, a hitch arm 20 connects the trailer 12 to thebicycle 10. The hitch arm 20 may have a plurality of drive axles 22 a-ewhich are connected to each other by knuckle joints 24 a-e. The knucklejoints 24 a-e provide multi-axes freedom so that the drive axles 22 a-ecan rotate. The drive axle 22 a may be mechanically coupled to theoutput shaft 26 of the motor 14 as shown in FIG. 3. In particular, thedrive axle 22 a may have a first pulley or gear 30 fixedly attached tothe drive axle 22 a. A second pulley or gear 31 may also be attached tothe output shaft 26 of the motor 14. The pulleys or gears 30, 31 of thedrive axle 22 a and the output shaft 26 may be connected to each otherby a belt, chain or other device 32 to transfer the rotational motion ofthe output shaft 26 to the drive axle 22 a.

When the output shaft 26 rotates, the power of the output shaft 26 istransferred to the drive axle 22 a through the belt 32. The drive axle22 a is held in a stationary position by sleeve 34. A cross section ofthe sleeve 34 is shown. The sleeve 34 is rigid and covers the driveaxles 22 a-c. The sleeve 34 may be fixedly attached to the loadingplatform 36 of the trailer 12 with welding, nuts and bolts, etc. orother methods known in the art or developed in the future. The driveaxle 22 a is allowed to rotate within the sleeve 34 by way of bearings38, as shown in FIG. 2. One or more bearings 38 may be located withinthe sleeve 34 to support the drive axle 22 a so that the drive axle 22 adoes not mar up or damage the interior surface of the sleeve 34.

Rotational power of the drive axle 22 a is transferred to drive axle 22e by way of drive axles 22 b, c and d. The sleeve 34 may extend outwardfrom the rear wheel 18 of the bicycle 10 to allow the user to make aright turn. When the bicyclist makes a right turn, the back side of therear wheel 18 would move toward the sleeve 34. The curve in the sleeve34 allows the back side of the rear wheel 18 to enter the space definedby the curvature of the sleeve 34 as shown by dash lines 76 in FIG. 2.The rear wheel 18 does not hit the sleeve 34 but rather fits within thespace created by the curved sleeve 34. The sleeve 34 may also housedrive axle 22 b as well as drive axle 22 c. Two bearings 38 may supportthe drive axle 22 c within the sleeve 34 to prevent damage to the sleeve34 by rotation of the drive axle 22 c. Drive axle 22 b connects driveaxles 22 a and c within the sleeve 34 and allows the bend or curvewithin the sleeve 34. Knuckle joint 24 a and 24 b allow the drive axles22 a, b and c to turn in unison or rotate within the sleeve 34 andtransmit power to the drive axles 22 d and e. Drive axle 22 e isconnected to transmission 62. The knuckle joints 24 c and d allow thetrailer 12 to move up and down and left and right with respect to thebicycle 10 so that the bicycle 10 and trailer 12 can traverse overuneven terrain and turn left and right. It is contemplated that thesleeve 34 and drive axles 22 a-e may be mounted on the opposite side ofthe bicycle 10.

Referring now to FIG. 3, the battery 40 and the controller 42 may bemounted to the underside of the loading platform 36. The battery 40 mayprovide power to the motor 14 to rotate the output shaft 26. The battery40 may also be rechargeable and replaced when defective. The controller42 is operative to regulate the amount of power that the battery 40provides to the motor 14. The user may have a switch 44 (see FIG. 1)located on the handlebar 46 of the bicycle 10 that communicates with thecontroller 42. The switch 44 is operative to command the controller 42to send more or less power to the motor 14 from the battery 40 to speedup or slow down the output shaft 26. The switch 44 may communicate withthe controller 42 through wireless communication or wired communicationthat is routed through the frame 48 of the bicycle 10 and sleeve 34.

Referring now to FIG. 4, an exploded view of the rear wheel hub area ofthe bicycle is shown. The rear hub 16 may have a standard mountingbracket 48 for a brake disc. A first bevel gear 50 may be mounted to themounting bracket 48 with six screws 78 (only one is shown in FIG. 4 forclarity) that attach the first gear 50 to the mounting bracket 48. Aring gear 52 may be mounted to the outer periphery of the first bevelgear 50. A housing 54 (see FIG. 2) may be secured to the hub 16 by wayof the ring gear 52. More particularly, the ring gear 52 is seatedwithin a first portion 80 of the housing 54. The ring gear 52 allows thefirst bevel gear 50 to rotate within the housing 54.

Second bevel gear 56 may be mounted to a second portion 82 of thehousing 54 by way of ring gear 58. The ring gear 58 is secured to thehousing 54. The drive axle 22 e is secured to the second bevel gear 56so that as drive axle 22 e rotates, the second bevel gear 56 rotates.The teeth of the second bevel gear 56 mesh with the teeth of the firstbevel gear 50. The second bevel gear 56 transmits power to the firstbevel gear 50 which transmits power to the rear axle 74 and rear wheel18.

Referring now to FIG. 5, a cross sectional view of an assembled hub 16and transmission 62 is shown. The transmission 62 may be mounted to arear wheel hub 16 that can accept a disk brake. In particular, the rearwheel hub 16 may have a mounting bracket 48 for the disc of the discbrake. Instead of mounting a disc to the mounting bracket 48, thetransmission 62 may be mounted to the mounting bracket 48. The firstbevel gear 50 of the transmission 62 is secured to the mounting bracket48 with screws 78. The first ring bearing 52 is seated onto the outerperiphery of the first bevel gear 50. The housing 54 is mounted to thefirst ring bearing 52.

Referring back to FIG. 4, the trailer 12 may be removed from the bicycle10 by way of a cotter pin 64. The cotter pin 64 connects the drive axle22 d to the drive axle 22 e. More particularly, the cotter pin 64 may beinserted into an aperture 66 formed within the drive axle 22 d. When thecotter pin 64 is inserted into the aperture 66, the cotter pin 64 alsoenters an aperture (not shown) formed in a cross member 68 of the driveaxle 22 e. To remove the trailer 12 from the bicycle 10, the cotter pin64 is removed to disengage the drive axle 22 d from the drive axle 22 e.To reattach the trailer 12 to the bicycle 10, the aperture 66 is alignedto the cross member 68 of the drive axle 22 e. The cotter pin 64 isinserted into the aperture 66 to reengage the drive axle 22 d and 22 e.Instead of a cotter pin 64, a ball lock pin or other attachmentmechanism is also contemplated.

During use, the bicycle 10 may be used to ride around the local area forpleasure. For this purpose, the trailer 12 may be detached from thebicycle 10. In particular, the bicyclist removes the cotter pin 64 todetach the drive axle 22 d from the drive axle 22 e. The trailer 12 isleft at home or at another secure location while the bicyclist rideshis/her bicycle 10. The weight of the motor 14, controller 42 andbattery 40 are not on the bicycle 10 but are on the trailer 12.Accordingly, the bicyclist can ride the bicycle 10 normally withouthaving to pull the weight of the motor.

When a heavy load needs to be transported from point A to point B, thebicyclist may reattach the trailer 12 to the bicycle 10. In particular,the aperture 66 of the drive axle 22 d may be aligned to the crossmember 68 of the drive axle 22 e. Cotter pin 64 is inserted into theaperture 66 to reattach the drive axle 22 d and 22 e. At this point, thebattery 40 should be charged and operative to send power to the motor14. Additionally, the switch 44 may be set to a speed of zero or off.The loading platform 36 may be loaded with the object to be transportedbetween points A and B. With the object on the loading platform 36, thebicyclist may mount the bicycle 10 and prepare to move forward. Thebicyclist may propel the bicycle 10 and trailer 12 in the forwarddirection by pedaling forward. Alternatively or additionally, thebicyclist may turn the switch 44 on to send a signal to the controller42 so that power from the battery 40 is provided to the motor 14. Themotor 14 rotates output shaft 26 and drive axles 22 a-e. Rotation of thedrive axles 22 a-e transmits power to the rear wheel 18 by way oftransmission 62. The rear wheel 18 propels the bicycle 10 and thetrailer 12 forward. Since the object is being pulled on the trailer 12by the bicycle 10, the stability of the bicycle 10 and trailer 12 is notcompromised. The trailer 12 allows the bicyclist to transport objectsthat might too heavy or too large to carry in a backpack or shoulderbag. Additionally, the motor 14 allows the bicyclist to traverse steepterrain or distances that are too large for the bicyclist to pedal.

The trailer 12 may have two wheels 70 which provide stability to theloading platform 36 and any object that might be loaded thereon. Theloading platform 36 may be configured to have sidewalls for containingthe object being transported between points A and B or even beconfigured as a baby carrier. The axle 72 of the trailer 12 is shown inFIG. 1 as being lower than the rear axle 74 of the rear wheel 18.However, it is also contemplated that the axle 72 of the trailer 12 maybe at or above the level of the rear axle 74 of the rear wheel 18. Theloading platform 36 may also be formed so as to provide a level surfacewhen the trailer 12 is attached to the bicycle 10.

Referring now to FIGS. 6 and 7, the trailer 12 a may have a single wheel88 instead of the dual wheel 70 shown in FIGS. 1-5. The single wheelversion of the trailer 12 a may be mounted to the rear axle 90 of therear wheel 18 of the bicycle 10. The rear axle 90 is also shown in FIG.7. The rear axle 90 may have a through axle 94 having a head 96 with agroove 98. The through axle 94 is inserted through the rear hub 98 sothat the rear dropouts 100 of the bicycle 10 fit between the head 96 ofthe through axle 94 and the rear hub 98. The overcenter lever 102 may beactuated to secure the rear axle 90 of the rear wheel 18 to the reardropouts 100.

The trailer 12 a is mounted to the through axle 94, and moreparticularly, to the groove 98 formed on the head 96 of the throughaxles 94. The drop outs 103 of the trailer 12 a may have an upper part104 that may be secured or fixedly attached to the forward portion 106of the trailer 12 a. The upper part 104 has a circular recess 108 thatmates with the groove 98 formed in the head 96 of the through axle 94.The drop outs 102 may also have a lower part 110. The lower part 110 mayalso have a circular recess 112 that mates with the groove 98. The upperand lower parts 104, 110 may be fastened together by way of bolt 114 torotatably secure the trailer 12 a to the bicycle 10. The recesses 108,110 are sufficiently large to allow rotation about the rotational axis116 defined by the rear axle 90. The trailer 12 a can rotate up and downabout the axis 116 as shown by rotational arrow 118.

Referring specifically to FIG. 7, a gear 120 may be attached to themounting bracket 122 additionally used to mount a disc of a disc break.The gear 120 may be mounted to the mounting bracket 122 by way of bolts124. A belt 126 or other drive transfer mechanism may be attached to thegear 120 and a sprocket 128 (see FIG. 6) of the motor 14. The belt 126transfers power from the motor 14 to the rear wheel 18 of the bicycle10. The motor 14 is preferably mounted to the forward portion 106 of thetrailer 12 a so that the motor 14 rotates about the rear axle 90. Assuch, the sprocket 128 of the motor 14 stays at a constant distance fromthe gear 120 as the bicycle 10 and trailer 12 a traverse over uneventerrain and the trailer 12 a pivots up and down as shown by arrows 118,130.

The trailer 12 a may also have a rear portion 132. The single wheel 88of the trailer 12 a is mounted to the rear portion 132. Moreover, therear portion 132 is pivotally mounted to the forward portion 106 so thatthe rear portion 132 may pivot left and right as shown by arrow 134about vertical pivot axis 136. Preferably, a distance 138 between thehorizontal axis 116 and the vertical axis 136 is equal to or greaterthan a diameter 140 of the rear wheel 18.

The trailer 12 a may operate in a similar fashion to the trailer 12discussed above. By way of example and not limitation, motor 14 may bepowered by a controller that is mounted to the rear portion 132 of thetrailer 12 a. The amount of power transmitted to the motor 14 may becontrolled by the rider by way of a switch 44.

The above description is given by way of example, and not limitation.Given the above disclosure, one skilled in the art could devisevariations that are within the scope and spirit of the inventiondisclosed herein, including various ways of attaching and detaching thetrailer 12 from the bicycle 10. Further, the various features of theembodiments disclosed herein can be used alone, or in varyingcombinations with each other and are not intended to be limited to thespecific combination described herein. Thus, the scope of the claims isnot to be limited by the illustrated embodiments.

1. A human powered vehicle comprising: a rear wheel of the vehicle having a hub; a trailer having two wheels for supporting the trailer; a motor mounted to the trailer and supported by the trailer, the motor defining an output shaft; a plurality of drive axles mechanically attached to the output shaft of the motor and the hub of the rear wheel of the vehicle for transferring power from the motor to the rear wheel of the vehicle; a rigid curved sleeve fixedly attached to the trailer with at least one of the drive axles rotationally embedded within the sleeve for allowing the vehicle to make a left or right turn.
 2. The vehicle of claim 1 wherein the two wheels of the trailer are free spinning wheels.
 3. The vehicle of claim 2 wherein an axle of the wheels of the trailer is at about the same level as the hub of the rear wheel of the vehicle.
 4. The vehicle of claim 1 further comprising: first bevel gear fixedly attached to the hub; second bevel gear engaged to the first bevel gear and operative to transmit power to the hub through the first bevel gear; and the plurality of drive axles are attached to an output shaft of the motor and the second bevel gear.
 5. The vehicle of claim 4 wherein the first and second bevel gears are seated within a housing.
 6. The vehicle of claim 1 further comprising a switch mounted to a forward portion of the vehicle to control the motor of the trailer.
 7. The vehicle of claim 6 wherein the switch and the motor are in wireless communication.
 8. The vehicle of claim 1 wherein the drive axles are connected to each other with knuckle joints.
 9. The vehicle of claim 1 wherein the vehicle is a bicycle.
 10. A trailer for a human powered vehicle, the trailer comprising: a frame having a storage area; a free wheeled suspension system mounted to the frame; a motor attached to the frame and mechanically coupleable to a rear wheel of the vehicle to rotate the rear wheel of the vehicle; and a rechargeable battery, and wherein the frame defines a forward portion and a rear portion pivotal to each other about a vertical pivot axis to allow left and right turns of the human powered vehicle, the forward portion being pivotable up and down to accommodate uneven terrain, the motor being an electric motor mounted to the forward portion and the rechargeable battery being mounted to the rear portion.
 11. A trailer for a human powered vehicle, the trailer comprising: a frame; a free wheeled suspension system mounted to the frame; a motor mounted to the storage area and supported by the free wheeled suspension system, the motor defining an output shaft; a plurality of drive axles mechanically attached to the output shaft of the motor and coupleable to the rear wheel of the vehicle for transferring power from the motor to a rear wheel of the vehicle; a rigid curved sleeve fixedly attached to the storage area with at least one of the drive axles rotationally embedded within the sleeve for allowing the vehicle to make a left or right turn. 